Strictly speaking, Nancy Pelosi is right. Led by Alexandria Ocasio-Cortez of New York, the four Congressional freshmen known as the Squad are, by Beltway standards, relatively powerless—just four votes, as the speaker said. They chair no committees and head no broad coalitions that can be counted upon to cast yeas and nays at their command. Yet they are important—and not merely due to their formidable social media following. Building on Bernie Sanders’ outsider progressive legacy in the Senate and his two surprisingly successful presidential campaigns AOC, Ilhan Omar, Ayanna Pressley and Rashida Tlaib are a symbol of the progressive challenge to a Democratic Party still controlled by Third Way/DLC/Clintonista/Rahm Emanuel corporatist right-wingers despite the fact that 72% of its voters are self-identified progressives. Progressive voters are watching. Is there room for them inside the Democratic Party? The signs are hardly encouraging. Left populist Democrats are still seething with disgust from 2016 when a DNC then chaired by Clinton hack Debbie Wasserman…